pybind11

基于pybind11实现Python调用c++编写的CV算法--下 （Linux+Cmake）

由 …衆ロ難τιáo~ 提交于 2020-05-05 13:16:14
C++ 是一种编译型(compiled)语言，设计重点是性能、效率和使用灵活性，偏向于系统编程、嵌入式、资源受限的软件和系统。 Python是一种解释型(interpreted)语言，同样也支持不同的编程范式。Python 内置了常用数据结构(str, tuple, list, dict)，简洁的语法、丰富的内置库(os,sys,urllib,...)和三方库(numpy, tf, torch ...)，功能强大。最为重要的是和能够和多种服务(flask…）和tensorflow、pytorch等无缝联合，从而方便将你的算法开放出去。 一方面，我们需要编译型语言(C++)性能；一方面，也需要解释型语言(Python)的灵活。这时，pybind11 可以用作 C++ 和 Python 之间沟通的桥梁。 Pybind11 是一个轻量级只包含头文件的库，用于 Python 和 C++ 之间接口转换，可以为现有的 C++ 代码创建 Python 接口绑定。Pybind11 通过 C++ 编译时的自省来推断类型信息，来最大程度地减少传统拓展 Python 模块时繁杂的样板代码， 已经实现了 STL 数据结构、智能指针、类、函数重载、实例方法等到Python的转换，其中函数可以接收和返回自定义数据类型的值、指针或引用。 由于在Windows上和在Linux上使用会有较大不同

Pybind11 Parallel-Processing Issue in Concurrency::parallel_for

由 时间秒杀一切 提交于 2020-04-18 05:43:56
问题 I have a python code that performs filtering on a matrix. I have created a C++ interface using pybind11 that successfully runs in serialized fashion (please see the code in below). I am trying to make it parallel-processing to hopefully reduce the computation time compared to its serialized version. To do this, I have splitted my array of size M×N into three sub-matrices of size M×(N/3) to process them in parallel using the same interface. I used ppl.h library to make a parallel for-loop and

Why are C# callbacks only executed when the python module uses cv.imshow()?

由 一笑奈何 提交于 2020-04-16 05:48:52
问题 I couldn't come up with a better more descriptive title as it involves 3 languages which I'll explain now. I wrote a C++ wrapper around a Python module, which works just fine in C++ by the way. I made a DLL out of this wrapper and exposed some functionalities as a C and used them in a C# application. The issue is, the C# application just hangs if I do not display the webcam feed. That is in Python module there is this condition: if self.debug_show_feed: cv2.imshow('service core face Capture',

Exposing Eigen::Tensor To Python Using Pybind11

由 心已入冬 提交于 2020-04-07 09:40:29
问题 I am trying to expose an Eigen tensor to python using pybind11. I can compile everything with no issue and can successfully import it to python. However, the data cannot be converted to a python type. I tried two methods. One is directly exposing the data and second using mapping. Both fail in python environment. #include <pybind11/pybind11.h> #include <pybind11/stl.h> #include <pybind11/stl_bind.h> #include <pybind11/numpy.h> #include <pybind11/eigen.h> #include <unsupported/Eigen/CXX11

PyBind11: binding a function that uses double pointers

由 半腔热情 提交于 2020-04-06 04:02:42
问题 I would like to bind a C++-function with PyBind11. The problem is that this functions has an argument with a double pointer and the compiler raises an error error: cannot initialize a parameter of type 'char **' with an rvalue of type 'typename make_caster<char **>::cast_op_type<typename std::add_rvalue_reference<char**>::type>' (aka 'char *') . Specifically the code look like this: #include <pybind11/pybind11.h> #include <iostream> namespace py = pybind11; void parse_args(int argn__, char**

PyBind11: binding a function that uses double pointers

由 心不动则不痛 提交于 2020-04-06 04:02:31
问题 I would like to bind a C++-function with PyBind11. The problem is that this functions has an argument with a double pointer and the compiler raises an error error: cannot initialize a parameter of type 'char **' with an rvalue of type 'typename make_caster<char **>::cast_op_type<typename std::add_rvalue_reference<char**>::type>' (aka 'char *') . Specifically the code look like this: #include <pybind11/pybind11.h> #include <iostream> namespace py = pybind11; void parse_args(int argn__, char**

Running Pybind11 on a Single Thread

由 冷暖自知 提交于 2020-03-26 03:05:30
问题 Is it possible to have pybind11 start a python interpreter on a single thread within C++? I have a class that initializes the interpreter and calls a function in a python script. I would like to call this function on multiple threads that C++ creates. #include "pybind11/pybind11.h" #include <iostream> #include <thread> namespace py = pybind11; class callMyPythonFunctionFromCpp { callMyPythonFunctionFromCpp() { m_module = py::module::import("mypython_script_file"); } void myfunc() // trying to

pybind11 running the test cases

由 自作多情 提交于 2020-03-16 06:39:47
问题 I'm trying to learn pybind11 and the first Google result is this page, where you should be guided towards compiling and running some test cases. From this page, I have installed bybind11 by: pip3 install pybind11 and I have installed: sudo apt install python3-dev cmake as instructed in the original page. But I don't know how to go to the next step which is to mkdir build ... and the rest of the steps to compile the test cases. I suppose this should be inside the pybind11 installation folder

pybind11 running the test cases

由 淺唱寂寞╮ 提交于 2020-03-16 06:39:42
问题 I'm trying to learn pybind11 and the first Google result is this page, where you should be guided towards compiling and running some test cases. From this page, I have installed bybind11 by: pip3 install pybind11 and I have installed: sudo apt install python3-dev cmake as instructed in the original page. But I don't know how to go to the next step which is to mkdir build ... and the rest of the steps to compile the test cases. I suppose this should be inside the pybind11 installation folder

Pybind11 multiprocessing hangs

由 假如想象 提交于 2020-03-12 05:11:48
问题 I'm writing an application that use Pybind11 to embed Python interpreter (Windows, 64 bit, Visual C++ 2017). From Python, I need to spawn multiple processes, but it seems doesn't works. I try the following code as test: import multiprocessing import os import sys import time print("This is the name of the script: ", sys.argv[0]) print("Number of arguments: ", len(sys.argv)) print("The arguments are: " , str(sys.argv)) prefix=str(os.getpid())+"-" if len(sys.argv) > 1: __name__ = "__mp_main__"
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